Plus one that was canceled before the first episode finished airing!
EDITED BY LB TO ADD: TURN-ON, which was canceled in mid-appearance in 1969 must hold the record for shortest-lived series. Being an alte cocker, I was privileged to actually have seen the episode, and all I can say is I’ve seen worse – much worse – debuts for shows that went on for years. (In fact, some of my own shows come to mind.)